I remember you making a post a few years ago that went straight to my heart. Probably more than any other post I've read.
Your husband spit in your son's face. He was a toddler at the time (or very young).

I'm so glad to hear you are going to leave him. He is a monster.
Take your dog to a shelter before you go, as your husband will cruelly take his anger out on this poor dog.

If necessary contact a center for abused women. They can help you leave him and get back to the other coast. They may also be able to help get your dog into a shelter or foster home if you are unable to do it on your own.

I wish you all the best. You deserve so much more than this.